In August 2018, a teenager named Greta Thunberg missed school to sit
outside the Swedish parliament with a sign that read School Strike for
Climate. She was demanding that government leaders take stronger action
against climate change due to global warming. At first, Greta sat alone.
But her message spread. Other students joined her in the movement that
became known as Fridays for Future. By September 2019, millions of
activists from around the world marched in protests to protect the
future of the planet.